2321221391 has 2 divisors, whose sum is σ = 2321221392. Its totient is φ = 2321221390.

The previous prime is 2321221373. The next prime is 2321221403. The reversal of 2321221391 is 1931221232.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2321221391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2321221391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2321221691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1160610695 + 1160610696.

It is an arithmetic number, because the mean of its divisors is an integer number (1160610696).

Almost surely, 2^2321221391 is an apocalyptic number.

2321221391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2321221391 is an equidigital number, since it uses as much as digits as its factorization.

2321221391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 2321221391 is about 48179.0555220835. The cubic root of 2321221391 is about 1324.0534625397.

The spelling of 2321221391 in words is "two billion, three hundred twenty-one million, two hundred twenty-one thousand, three hundred ninety-one".